C (graphite) and c (diamond) are examples of: select one:

a. isotopes of carbon.

b. allotropes of carbon.

c. the law of definite proportions.

d. different carbon ions.

Graphite and diamond are allotropes of carbon. Allotrophy is the existence of an element in more than one form but the same physical state. Carbon is an example of element that exhibits allotrophy; these are diamond and graphite; which differ in structure and chemical properties. Another element that exhibits allotrophy is sulfur; with monoclinic and rhombic sulfur.